1275 Cooper S - Cylinder head

General Chat with an emphasis on BMC Minis & Other iconic cars of the 1960's. Includes information on MK1 Action days.
richardACS
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1275 Cooper S - Cylinder head

Post by richardACS »

I'm looking to find the part number for a 1965 1275 S - Cylinder head - I'm told it should be AEG 163?

My parts book has AEG 165 - tapped and AEG 166 plain

Can anyone advise please?

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Aginley
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Re: 1275 Cooper S - Cylinder head

Post by Aginley »

Aeg163 but don’t waste your time looking for one.

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Aginley
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Re: 1275 Cooper S - Cylinder head

Post by Aginley »

You can’t convert to unleaded and if it’s for sale it’s probably scrap.

richardACS
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Re: 1275 Cooper S - Cylinder head

Post by richardACS »

Aginley

Does one need to convert to unleaded - mileage won't be great and Castrol sell an additive?

iain1967s
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Re: 1275 Cooper S - Cylinder head

Post by iain1967s »

Well, you certainly can convert an AEG163 for unleaded, but it needs specialist engineering to fit overlapping hardened valve seats. That’s exactly what Mini Mania did for the one I have on my car.

That said, finding a 163 that isn’t cracked is a real challenge, and in any case a Mk3 Cooper S 12G940 head [with 12G1805 stamped by the thermostat housing] is a much better option. The valves are only slightly smaller, but because they don’t overlap installing the hardened / unleaded valve seats is straightforward.

floormanager
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Re: 1275 Cooper S - Cylinder head

Post by floormanager »

I had one, not cracked but machine shop was wary of doing the work to make it usable and stopped machining it.

There's a couple on ebay. One looks scrap, the other is ££££££££££££££££

https://www.ebay.co.uk/itm/Classic-Mini ... Swz2pfTS5m

[url][https://www.ebay.co.uk/itm/AEG-163-38G3 ... VfS5SL/url]

Polarsilver
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Re: 1275 Cooper S - Cylinder head

Post by Polarsilver »

Given the Mileage "we" do i cannot see the need to fit valve seat inserts for unleaded .. great if you can find a good applicable to use Head otherwise i tend to take a useable 940 Head & Drill the two extra holes that are needed .. why not works for me.. anyway if it is for street use will you be able to tell the difference in performance with your much cheaper Cylinder Head with its slightly smaller valves .. me think not.. this solution gave me the waiting time to find & then splash loads of cash on the unused Longman Head that turned up 8-)

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Andrew1967
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Re: 1275 Cooper S - Cylinder head

Post by Andrew1967 »

Ive had a few 163's and they've all been cracked. Repair is possible but expensive and not necessarily a cure. If fact, I have a 163 that has cracked through a previous repair !!

A 940 '1805' is a better option as said and that is what HOY will be having.

I agree with Norman regarding unleaded conversions and valve seat recession ... I don't bother and 10000 miles on, my S engine hasn't suffered and neither has my 850 engine. Valve clearances haven't closed up. If anything I've had to adjust to tighten up on a rare occasion.

I'm not saying the VSR doesn't happen, but personally I haven't had any problems. Neither has Dad in his 1800 Landcrab.

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Peter1071
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Re: 1275 Cooper S - Cylinder head

Post by Peter1071 »

Aginley wrote:
Fri Sep 11, 2020 6:33 pm
You can’t convert to unleaded and if it’s for sale it’s probably scrap.
I have two cars running 163 heads which have been unleaded by Stuart Gurr at Vmax Scart. They haven't done many miles but have been working just fine for the past 15 or 20 years. He's just done another one for me a few months ago for another project.

I would agree that the 1805 head is a much better option as finding an un- cracked 163 is difficult.
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Costafortune
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Re: 1275 Cooper S - Cylinder head

Post by Costafortune »

Polarsilver wrote:
Fri Sep 11, 2020 10:13 pm
Given the Mileage "we" do i cannot see the need to fit valve seat inserts for unleaded .. great if you can find a good applicable to use Head otherwise i tend to take a useable 940 Head & Drill the two extra holes that are needed .. why not works for me.. anyway if it is for street use will you be able to tell the difference in performance with your much cheaper Cylinder Head with its slightly smaller valves .. me think not.. this solution gave me the waiting time to find & then splash loads of cash on the unused Longman Head that turned up 8-)
Similar scenario with cranks. Lots of the old S cranks are just doorstops now, reground to buggery and stress cracked. A well prepared A+ crank is just as good - you're not going to break it.

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